package com.uah;

import android.app.AlertDialog; 
import android.app.Service; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.os.IBinder; 
import android.provider.Settings; 
import android.util.Log; 
  
// class taken from http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/
public class GPSTracker extends Service implements LocationListener { 
  
    private final Context mContext; 
  
    // flag for GPS status 
    boolean isGPSEnabled = false; 
  
    // flag for network status 
    boolean isNetworkEnabled = false; 
  
    // flag for GPS status 
    boolean canGetLocation = false; 
  
    Location location; // location 
    double latitude; // latitude 
    double longitude; // longitude 
  
    // The minimum distance to change Updates in meters 
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters 
  
    // The minimum time between updates in milliseconds 
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute 
  
    // Declaring a Location Manager 
    protected LocationManager locationManager; 
  
    public GPSTracker(Context context) { 
        this.mContext = context; 
        getLocation(); 
    } 
  
    public Location getLocation() { 
        try { 
            locationManager = (LocationManager) mContext 
                    .getSystemService(LOCATION_SERVICE); 
  
            // getting GPS status 
            isGPSEnabled = locationManager 
                    .isProviderEnabled(LocationManager.GPS_PROVIDER); 
  
            // getting network status 
            isNetworkEnabled = locationManager 
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER); 
  
            if (!isGPSEnabled && !isNetworkEnabled) { 
                // no network provider is enabled 
            } else { 
                this.canGetLocation = true; 
                // First get location from Network Provider 
                if (isNetworkEnabled) { 
                    locationManager.requestLocationUpdates( 
                            LocationManager.NETWORK_PROVIDER, 
                            MIN_TIME_BW_UPDATES, 
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
                    Log.d("Network", "Network"); 
                    if (locationManager != null) { 
                        location = locationManager 
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
                        if (location != null) { 
                            latitude = location.getLatitude(); 
                            longitude = location.getLongitude(); 
                        } 
                    } 
                } 
                // if GPS Enabled get lat/long using GPS Services 
                if (isGPSEnabled) { 
                    if (location == null) { 
                        locationManager.requestLocationUpdates( 
                                LocationManager.GPS_PROVIDER, 
                                MIN_TIME_BW_UPDATES, 
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
                        Log.d("GPS Enabled", "GPS Enabled"); 
                        if (locationManager != null) { 
                            location = locationManager 
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
                            if (location != null) { 
                                latitude = location.getLatitude(); 
                                longitude = location.getLongitude(); 
                            } 
                        } 
                    } 
                } 
            } 
  
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
  
        return location; 
    } 
  
    /** 
     * Stop using GPS listener 
     * Calling this function will stop using GPS in your app 
     * */
    public void stopUsingGPS(){ 
        if(locationManager != null){ 
            locationManager.removeUpdates(GPSTracker.this); 
        } 
    } 
  
    /** 
     * Function to get latitude 
     * */
    public double getLatitude(){ 
        if(location != null){ 
            latitude = location.getLatitude(); 
        } 
  
        // return latitude 
        return latitude; 
    } 
  
    /** 
     * Function to get longitude 
     * */
    public double getLongitude(){ 
        if(location != null){ 
            longitude = location.getLongitude(); 
        } 
  
        // return longitude 
        return longitude; 
    } 
  
    /** 
     * Function to check GPS/wifi enabled 
     * @return boolean 
     * */
    public boolean canGetLocation() { 
        return this.canGetLocation; 
    } 
  
    /** 
     * Function to show settings alert dialog 
     * On pressing Settings button will lauch Settings Options 
     * */
    public void showSettingsAlert(){ 
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); 
  
        // Setting Dialog Title 
        alertDialog.setTitle("GPS is not set"); 
  
        // Setting Dialog Message 
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?"); 
  
        // On pressing Settings button 
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() { 
            public void onClick(DialogInterface dialog,int which) { 
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
                mContext.startActivity(intent); 
            } 
        }); 
  
        // on pressing cancel button 
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
            public void onClick(DialogInterface dialog, int which) { 
            dialog.cancel(); 
            } 
        }); 
  
        // Showing Alert Message 
        alertDialog.show(); 
    } 
  
    @Override
    public void onLocationChanged(Location location) { 
    } 
  
    @Override
    public void onProviderDisabled(String provider) { 
    } 
  
    @Override
    public void onProviderEnabled(String provider) { 
    } 
  
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) { 
    } 
  
    @Override
    public IBinder onBind(Intent arg0) { 
        return null; 
    } 
}